Abstract: In response to the drilling difficulty and bad anchoring effect in the construction processing of roadway floor bolt-mesh-cable, field investigation has been adopted to analyze the reason. The result shows that ranging from floor surface to some depth in the drilling is mainly broken bits rock, which is entangled in interspace between drilling pipe and hole’s wall by friction of drilling pipe and waggle of drilling machine; the smaller rock block is unstable and caving after drilling pipe have been pulled out. There is some thickness pasty slurry in the surface of drill for reducing the cutting effect which is mixed by rock debris and water. The broken bits rock is hindering evenly stirring anchoring agent by bolt and cable, decreasing the effective contact area of bolt and anchoring agent. The concentration of synthetic resin and curing agent is reduced by water of slurry, and slowing reaction time. Decreasing the property of anchoring agent by rock debris which is located in the anchor solid between bolt and surrounding rock. Therefore, the device to improve the drilling’s efficiency and anchoring effect of roadway floor bolt and cable has been put forward. The results of studying its structure form and working characteristics by field experiment show that: the device where special drilling pipe is staying in the drilling can efficiently prevent drilling collapsing within the scope of roadway floor some depth. The time of drilling and installing the bolt or cable is shortened, and the success rate of drilling and one-time anchoring can reach up to 100% and over 95%. Therefore, the construction efficiency will increase obviously.

Key words: mining engineering, roadway floor, bolt-mesh support, high-efficiency construction